Work order backlog
Work order backlog is the count, and average age, of open work orders that are unscheduled, unassigned, or otherwise not yet completed, tracked to see how much demand is outpacing dispatch capacity.
The two views.
- Open countWork orders that are unscheduled, unassigned, or otherwise not yet completed at a point in time.
- Average ageHow many days those open orders have sat — ten orders open two days is a different picture than ten open two weeks.
- Watch forA backlog that grows steadily rather than seasonally is a hiring or rebalancing signal, not just a dispatch one.
What to know before you track it.
How to calculate work order backlog
Backlog is usually reported two ways: a raw count of open, unscheduled or unassigned work orders at a point in time, and an average age — how many days those orders have sat open. The age figure matters as much as the count, since ten work orders open for two days is a very different operational picture than ten work orders open for two weeks.
Why work order backlog matters for commercial contractors
Backlog is the clearest early-warning signal that demand has outrun capacity, and it's usually visible in the numbers before it shows up as missed SLA windows or customer complaints. It's also a direct input into hiring and capacity planning decisions — a backlog that's growing steadily rather than seasonally is a signal to add crew or rebalance branches, not just push harder on dispatch.
What causes backlog to grow
Understaffing relative to demand is the obvious cause, but poor dispatch sequencing and seasonal demand spikes — a heat wave hitting a commercial HVAC book all at once — are just as common. A backlog that spikes seasonally and clears afterward is a different problem than one that trends upward year over year regardless of season.
How Thermal tracks work order backlog automatically
The dispatch board shows live backlog count and age by branch, status, and priority, so it doesn't require a separate report to pull. Because backlog is calculated from the same work orders that run day-to-day dispatch, it's current the moment a work order is scheduled or completed, not as of last night's export.
Questions attached to this term.
How is backlog age measured?
Typically as calendar days since the work order was created and left unscheduled or unassigned, though some contractors measure from the customer's requested date instead if it's later than creation date.
What's a healthy backlog size?
It depends heavily on crew size, season, and job mix — treat any published target as general guidance and watch the trend against your own historical baseline rather than a fixed number.
Does backlog include PM visits?
It can, depending on how you configure it — some contractors track reactive-call backlog separately from PM backlog since the two have very different urgency profiles and staffing implications.
Can backlog be viewed at the branch level?
Yes — branch-level backlog is usually more actionable than a company-wide number, since it points directly at where capacity is short rather than averaging that signal away across the whole operation.
These numbers, on your own book.
If you want to see them calculated from real work orders and agreements rather than a spreadsheet, that's a demo.